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The signal on 191khz sounds like an AM signal, there are no LW broadcasters currently on that freq, the BBC is on 198khz along with an NDB in Dixon NC. The signals that I heard from your recording below 191khz sounds like hams, heard 2 or 3 sending morse code and another sending 45.5 baud RTTY between 150 and 180khz. A good low pass filter that attenuates signals above 500khz would block these. Without my low pass filter connected I can hear hams and AM broadcast stations operating on MW and higher frequencies at 150 to 500 khz. Your MW/FM Notch filter should be attenuating those bands but they have no impact above 1700khz. I always use the Hi-Z port on frequencies below 30 Mhz, although it is susceptible to overloading, occasionally it is necessary to insert a 10db attenuator. I am getting the impression that your incoming RF is simply too strong and your RSP2 is being overloaded.

As a test, I have my antenna connected to the A port. It's raining here so noise levels are higher. Here are 2 screenshots, the first is with Port A the second is HiZ. I can hear DIW in Dixon NC on both ports. For comparison, on A it is at -116.6 dbm with an SNR of 22 On the Hi-Z it is at -91.7dbm with a 24 SNR. I've made no other changes in settings to make this comparison. AGC was on manual at this time set to 30db, RF gain at maximum. The receiver was tuned to 198khz, DIW's carrier frequency. You can see the morse ID at about 1 khz above and below the carrier frequency in the screenshots.